Stovepipe-forming machine.



R. R. DIETRICH.

STOVEPIPE FORMING MACHINE.

APPLICATION mso MAY ls. |914.A

1,138,639. l wanted May11,1915. 'i

4 SHEETS-SHEET I.

R. R. DIETRICH.

STOVEPIPE FORMING MACHINE.

APPLlcAnoN msn Muis. i914.

1:2138639. 1 y P atened 11519151;

4 SHEETS-SHEET 2.

l H @www0/@mmf ATTO/M761.

R. R. DIETRICH.

STOVEPIPE FORMING MACHINE.

APPuc/mon man 111118.1914.

1,138,639. l Patented 111131111915.

' 4 SHEETS-SHEET 3. R.

IIIIIII l gm? nle'rminlv l I l. STOVEPIPE'FORMING' MACHINE. l. A APPLATlon man nula. i914.

v 1,138,639. gf y ,Patented May-1,1, 1915.11.

ATM/mm1 EICHRD R. DETRCH, OF'ST. LOUIS, IISIIISSOUZRI.

STOVEPIPE-FORMING MACHINE.

Specification of Letters Patent.

Patented May 11, 1915.

Application led May 18, 1914. Serial'No. 839,317.

T0 all whom 'it may concern:

Be it known that I, RICHARD R. DIETRICH, a citizen of the United States, residing at St'. Louis, State of Missouri, have invented certain new and useful mprovements in Stovepipe-Forming Machines, of which the following is a full, clear, and exact description, reference being had to the accompanymg drawings, forming apart hereof.

My invention has relation to improvements in stove-pipe forming machines; and it consists in the novel features of construe-- tion more fully set forth in the specifica'- tion and pointed `out'in the claims.

In the drawings, Figure 1 is an end elevation of the machine; Fig. 2 is a side elevation thereof; Fig. 3 is a top plan of the machine; Fig. 4 is a vertical cross-section on the line 4--4 of Fig. 3 `,looking to the right, the train of gears being indicated by dotted lines; Fig. 5 is a horizontal sectional detail on the line 5 5l of Fig. 1; Fig. 6 is a plan view of a portion of the die or female member receiving the main punch or former; Fig. 7 isa cross-section on the line 7'7 of Fig. 6; Fig. 8 is an inside elevation of one of the side complementary dies or blocks cooperating with the main former; Fig. 9 is a cross-section of .the main former on the line 9-9 of Fig. 2; Figs. 10 and 11 are diagrammatic views of the former-actuating cams and of the bell-cranks operating the toggles which impart reciprocation to the cross-head or plunger to which the former, is secured; Fig. 12 is a diagrammatic view of the cam and lever which retracts the side die; Fig. 13 is a diagrammatic view of the cam and bell-crank which forces the side die against the main former or punch; and Fig. 14 is a perspective of a stove-pipe bent, swaged and crimped by my limproved machine.

The present invention is directed to the swaging, crimping, and bending of sheet metal blanks to bring them to the point where they may be locked into the forml of a stove-pipe, the locking being accompanied by the bringing together of the lips 1or folds formed on .the opposite edges of the blank aswell understood in the art. These lips or folds are formed by what are termed edging machines, the blanks oper= ated on by my improvement beirg previf ously edged by any standard e ging ma,

chine known tothe art, said edging operation being foreign to the machine forming the subject-matter of my invention, the latterl dealing only with blanks which have previously been edged. The invention is therefore restricted to a machine adapted to bend, swa'ge-and crimp a previously edged blank, the product of the machine being an open or non-locked pipe ready to place' on the market, such pipe being subsequently locked by the consumer or retailer dealing in this class of ware. p

The objects sought are to constructl a machine which` will bend and swag'ev the` blankv (that is to say, put a bead on lthe pipe), land crimp the pipe along distinct sections of its periphery by means ofa suitable die and former, thus dispensing-with the use of'crimping rollers which crimp the pipe around its entire periphery, resulting in a construction objectionable in practice as it gives rise to undue leakage between theipe sections when assembled.

e product of my present machine is not here claimed, the same forming the subjectmatter of a distinctvapplication `for patent,

the application herein being restricted to the machine by which the product is manufactured.

A further object is to construct a machine which is positive andguniform in action, stable, one possessing a minimum number of parts, one v'having a maximum capacity, and one possessing further and other advantages better apparent from a detailed description of the invention, which is as follows:

Referring to the drawings, B represents a suitable base -or frame carrying the standards S, S, disposed in pairs, each pair having bolted thereto a plate or wing 1, a central cross-bar or beam 2 spanning the base B, being cast or formed integrally with said dogs 5, 5, being shown in their highest position in the drawings, but in operation being susceptible of depression beneath the blank fz with a rearward stroke. of the feed 3, by reason of' the yielding of the springs, (not shown) by which the dogs are controlled. The feed 3 operates across the top of a frame or bracket 6 supporting the outer ends of the longitudinally grooved edgingr members 7, 7, which, as the blanka is advanced between them, turn the oppositel edges of said blank in proper direction so as to form the locking folds b, b, the formation of said folds being termed in the art as edging. The inner ends of the members 7, 7, are secured to a-bar 71 between the standards S, S, or in any other suitable mechanical manner. The above features, and the edging machine of which said features form a part, are old. and well understood` in the art, and are onlyv conventionally illustrated herein, a passing. reference thereto being considered sufcient forour present purpose. They are alluded toy herein, for. the reason that the edged blank is fed directly to thema-chine forming the subject-matterVV ofrmy present invention. Formed in thef l wings or plates 1, 1, are vertical slots-8,. bounded by rib Vformations. 1', 1', in which slots operates a reciprocating,cross-head or plunger 8, `the ends of `the cross-heady whavf l'ates v9, i

ing bolted'y'thereto thesIide's or which '.,ride' over the ribs 7,1', Fig. 1)',

although l.- do notfwish to klimit myself'tov any specific method ofmou-nting the..cro ss bead in its ways. `The said cross-head (and the partsA carriedthereby, as presently -to 4be more fully described) is counterweighted, a

rod 10 leading from the cross-head and passing loosely through the beam 2, having its upper end pivotally coupled to the forked terminal of a lever 11 pivoted between the ears or lugs 12, 12, on one ofthe wings l, the outer arm of the lever carrying an adjustable counter-weight W. To allow for the slight arcuate movement of the inner lever arm, the latter is provided with an elongated slot t at the pivotal connection with the rod 10 whereby an undue binding on the rod is prevented (Fig. 2). Formed with, or carried by the cross-head 8 is a wall or web 13 to the lower end of which is in turn secured the cylindrical punch or former 111-, the latter being provided at points contiguous to, but removed from, the opposite ends thereof with swaging formations or circular ribs a, the portion ofthe former outside one of said ribs being provided with a series (three in the present case) of ribs or crimping formations w for a purpose resently to appear. Coperating with the bottom section or substantially the lower y half of the peripheral surface of the former '14;,is a stationary die 1,5 having an inner ing 16 provided at one end with formations uf, lw', coperating with the formations u, lw, of the former 14, said die being positioned at the bottom of the U-shaped recess or cavity V formed in the block 17 carried by the base B between the standards S, S, (Figs. 1, 2,). Operating horizontally across this cavity from opposite sides thereof are the complementary dies 18, 18, provided with inner substantially quarter-cylindrical concave faces, said dies being mounted in pas-- sage-ways or openings O in the block 17, the outer faces of the dies being provided with outer pairs of ears 19 to each of which is coupled the inner end of a link 20, the outer end whereof is pivotally secured to the end of .the long arm of a vertically oscillating bell-crank lever 21 pivoted to a U-shaped bracket 22 secured to the side of the -base B, the short arm of the lever being forked and provided with a roller 23. The outer end of eachdie 18 is further provided with au intermediate pair of ears 19, 19, to which is likewise pivoted 'the inner end of a link 2O to whose outer end is however pivotally coupled the end of the upper arm of a lever 24(0f the first class) which is fulcrumed at the outer end of an angle-bracket-E likewisesecuredA to the side of the base B, the shortarm o f said lever carrying a roller 21.

Disposed withinthe base B (which is in v thereof and below said die, are tubular standards 26, 26, (secured to suitable. bases 27) which are traversed by vertically recipl I'ocating rods or followers 28 normally held elevated by coiled compression springs 29 housed in the tubes 26 on which springs the rodsrest. The rods pass freely through openings c' in the die 15 and its bushing 16 (Fig. 6), their .purpose hereinafter more `fully appearing. The complementary dies 18 are provided with bushings 18 which have formed thereon suitable formations u and w coperating with the complementary formations u, w, on the former 14.

Disposed at each end of the bottom of the cross-beam 2, are brackets 30, (Fig. 2) to each of which is hinged the upper member or link 31 of a toggle joint, the opposite end of said link and the upper end of the lower or complementary link 31 of said toggle joint being pivotally secured to the reduced terminal or spindle 7L of a connecting bar 32, said spindle h traversing one end of a loop or link 33 the opposite ends whereof terminate in ears a to which are pivotally secured the adjacent ends of the links 34, 34, the lower end of the link 34 being pivotally secured to the upper end of the long arm of a bell-crank lever 35 pivotally mounted at the outer end of a Ueshaped bracket 36 projecting from the side of the base B, and the lower end of the link 34' being .pivotally securedto theupperend of the long arm of a complementary bell-crank lever 35' pivoted on the opposite side of the base B to a similar bracket 36. The short arms ofthe bell-cranks 35, 35', carry rollers .e, c, as shown.

It will ,be apparent .from the foregoing th'at a horizontal reciprocation imparted to the link `or loop 33 will vproduce ya corres'ponding expansion and contraction of ,the toggle-joint composed of the members 31, 31'. The upper pivotal ends of the links 31 1 are fixed, being secured to the brackets 30 of the stationary cross-beamY 2, so-that with 'the expansion or contraction of the toggle, only the lower ends of the links 31', 31', are free to yield and reciprocate vertically. These ends are secured to the` brackets 30' carried by the cross-head 8, so that with any expansion and contraction of the togglejoint brought about by the horizontal reciprocation of the loop 33,-a corresponding vertical reciprocation will be imparted to the cross-head 8 and to the web 13 and former 14 thereof. AThis horizontal reciprocation of the loop 33, (and hence the vertical reciprocation of the cross-head 8) is brought about by the oscillations of the levers 35,435', which in turn reciprocate the links 34, 34', coupled to said loops and thereby impart the necessary reeiprocation -to the loop. Obviously, as the toggle links 31, 31' open and close (that is to say expand and contract) the joint between them at :which the loop 33 is coupled will fall and rise accordingly, causing the loop to participate in a vertical movement at the same time it is reciprocating horizontally. This is obvious vfrom an inspection ofFig. 1 of the drawings.

The mechanism by which the oscillations referredl to are imparted to the levers 35, 35', is as follows: Mounted on one side of the base B is a cam-shaft 37, a parallel lcamshaft 37' being mounted on the opposite side of said base. Disposed on the'sha'ft 37 oppositethe rollers c, e, of the bell-cranks 35, 35, are cams 38, (concealed in Fig. 3 by the levers 35, and one ofthe cams being seen in Fig. 1) having arcuate portions m, y, concentric with, but described with different lengths of radii from, the axis 'of rotationof the shaft. Disposed on the shaft 37 opposite the rollers e, e, of the bell-cranks 35', 35', are cams '39, having two arcuate concentric portions d, f, described with different lengths of radii, the adjacent ends of the curves d, f, being connected bysubstantially a reverse curve as seen to best advantage in the diagrammatic illustration in Fig. 11.

For the present we need only assume that the shafts 37 37', are rotating in the same direction (counter-clockwise) and that the rollers of the bell-cranks 35 are in engage- `ment with the circular portions of the cams v38 and the rollers of the bell-cranks v raising the cross-head 8 4and the former 14 carried thereby (Fig. 1).y As the shafts 37, 37', continue their rotation, the surface y of the cam 38 will engage the roller e of the bell-crank 35, raising the short lever arm thereof .(the elevation ofthe roller end of said arm starting at a pointon the flat side of the cam between the curved faces y,) and oscillating the bell-crank toward the right (dotted position in Fig. 10), and at the same time the cam 39,will present the formation f, to the roller end of the short arm of the bell-crank 35', allowing the bellcrank to oscillate to the right (dotted position Fig. 11), thus reciprocating the links 34, 34',',to the right and straightening or expanding the toggle linksv 31, 31', by drawing the loop 33 to the right, the straightening of said links forcing down the plunger or cross-head 8 and the former 14 carried thereby (see dotted position Fig. 1). The former 14 in its down-stroke encounters the blank a spanning the recess or gap V in the block 17, driving it onto the die 15 and bending it into a substantially U-shaped form (see dotted position Fig. 1). As the .shafts 37, 37', continue in their rotation,

the operation of course is repeated so far as the reciprocation of the former 14 is concerned, the feeding of the blank a being presently more fully explained. In the forming vof the pipe, the blank which has been bent U-shaped by the downstroke of the'former 14, must be bent into a substan-' tially circular form (in cross-section, that being the cross-section ofa cylinder, the form of which the completed pipe assumes when folded over the entire periphery of the former), and this is accomplished b v the inward stroke of the die-blocks 18 which force the sides of the partly bent blank against the -sides of the former 14. The mechanism for driving the dies 18 inwardly is as follows: 0n each of the shafts 37, 37', and between the cams 38, 38, and 39, 39, respecti'if'ely are cams 40 (Fig. 13), each cam being provided with an arcuate or circular formation or surface g tapering to a nose 7), said cams engaging the rollers 23 at the ends of the short arms of the bell-cranks 21. As the noses p pass over the rollers the long arms of the bell-cranks are-oscillated inwardly, thereby causing the links 20 leading-"from said arms to oscillate inwardly from opposite directions, and simultaneously driving inward the blocks or dies 18 against the partly bent blank a and into forcible Contact against the sides of the peripheral portions of the former 14, the edged edges of the blank engaging the spacing web or wall 13 from opposite sides, the said web preventing the total clos` ing of the resulting cylinder. into which the blank is bent. It maybe stated in passing that the cams are so set as to permit the dies 18 to reciprocate inwardly while the former 14 is held in its depressed position, the interval of time during which the former is down correspondingfto the time that the rollers e, e, of the bell-cranks 35, 35", are passing over the formations y and f of the cams 38, 39, (Figs. 10, 11), during which the toggle-links 31, 31', are extended or straightened. out.

As soon as the noses 7? of the cams 40 have passed off the rollers 23 of the bell-cranks 21, the'latter are permitted to swing outwardly (the rollers now riding over the concentric faces g of the cams), thereby permitting the retraction or outward movement of the blocks 18, that is to say, an outward stroke thereof. This outward stroke is brought about by the cams 41, 41, on the respective shafts 37, 37', each cam having a circular concentric formation lo and a siiiuous depression l (Fig. 12) over which is free to ride the roller 24 at the end of the short arm of the retractin link 20 is coupled to the lock 18 as previously described. When the low formations g of the cams 40 come opposite the roll# ers 23 of the driving bell-cranks 21, the high formations la of the cams 41 engage the rollers 24 of the levers 24, cans* ing the long arms of the latter to oscillate outwardly, thereby pulling on the links 20 connected thereto, and drawing the dies or blocks 18 outwardly, theinward stroke of the latter following subsequently when the noses p oscillate the bell-cranks 21 inwardly, by which time the low formations Z will come opposite the rollers 24` of the retractig levers 24, allowing the latter to oscillate inwardly as clearly apparent from Figs. 12,13.

It was stated above that with a descent of the plunger or cross-head 8, the former 14 v bends the blank a spanning the recess or gap V into a substantially U-shaped form. In this connection it may be stated that as' the blank a spans the gap V, the upper ends of the followers or rods 28 operating in the tubes 26 are practically in contact with the under surface of the blank, the followers being held elevated by the springs 29 which fill substantially the lower third of the tubes; and when the former 14 is driven d own against the die 15, the followers 28 are depressed, the springs 29 of course be.-

lever 24 whose ni-sessie ing compressed. As the former 14 is subsequently lifted, the followers under the tenslon of their driving s rings 29 rise, and in a measure assist the ormer 14 in the dislodgment of the bent pipe out of the die 15, the swaged and crimped pipe having a tendency to stick more or less to the die after the forming operation is completed. 1f the pipe became unduly stuck to its die, there would be the` danger of the former 14 on its upward stroke leaving the pipe behind were it not for the assistance rendered by the followers as just described. In its passage across the gap V the blank is guided between the angle-bars or guides G, G.

Rotation to the cam-shafts 37, 37 may be imparted in any way known tothe art, but in the present embodiment of my invention 1 make'the following provision: at one end of the base B 1 mount a belt pulley 42, the belt 43 from which leads to any suit able source of power (not shown). On the short shaft or spindle 44 of the pulley is mounted a gear wheel 45 which meshes with the terminal gear wheel 46 at the adjacent end of a shaft 47 mounted on the base B and disposed parallel to the cam-shafts, the opposite end of said shaft 47 carrying a pinion 48 meshing on one side with a gearwheel 49 on the cam shaft 37. Assuming that the pulley 42 rotates in the direction indicated by the arrow in Fig. 1, it follows that the 'gear-wheel 49, and hence the cam shaft 37 will rotate in the same direction or counter-clockwise (Fig. 4). The pinion 48 meshes on the opposite side with a gear wheel 50 carried by a spindle 51 mounted on the base B, the gear 50 meshing with a similar gear wheel 52 carried by a stud 53 mounted on the base B, the gear wheel 52 meshing with a gear 54 at the adjacent end of the camshaft 37 the train of gears thus imparting rotation to the two cam-shafts 37 37 in the same direction (Fig. 4). Any equivalent means of driving the cam-shafts falls within the spirit of my invention.

After the former 14 is lifted to its highest position, and before it descends to bend, swage and crimp a fresh blank a, some provision must be made to dislodge and eject the bent pipe wrapped around it. The completed pipe is represented by R and is shown lto good advantage in Fig. 14. lThe ejecting device is as follows: Mounted on a shaft 55 on the frame F, and meshing with the gear wheel4 49 is a gear wheel 56, the outer face of which is provided with a cam 57 (Figs. 2, 3, 4,). The cam rotatesl in the path of the roller 58 at the end of the short arm of a bent lever 59 pivoted to an arm or bracket 60 at the top of a standard or post 60 mounted on the machine frame F, the free end of the long arm of said lever being provided with a slot s elongated in the general direction of the length of the lever, the said slot being traversed by a pin 61 carried at the center of the outer terminal cross-bar of a horizontally reciprocating U-shaped ejecting frame 62, the sides whereof are guided between the lugs 63 of a yoke or bracket 64 spanning and secured to the inverted U- shaped `brackety 6 carried by the: frame F, the sides of the ejecting frame 62 being further guided in bearings provided therefor in the cross-bar 66 secured between the adjacent standards S, S'. 'The' inner ends' of the arms of said ejecting 'frame terminate in inwardly defiectediingers'67,adapted to engage the adjacent end ofthev completed pipe R loosely wrapped about tlreorrer 14 when the latter is in' its elevated osition (Fig. 2).' The bracket 644 is'I secure to and surmounts the bottom bracket 40 1" frame 6 carried by the frame F, saidbracket 6 not only supporting the'cuter'endsl ofthe stationary edging members-71, l1-but likewise' guiding the reciprocating feed-'frame 3 which carries the lugs 4 and yielding dogs 5. As stated above, the7 edging machine and members 7, 7, are old in the art 'and are not concerned, except incidentally with my present invention.

The operation may be summarized as followsz` Let us assume that rotation is imparted in properdirection to the pulley 42, and that the necessary reciprocation has been imparted to the feed frame v'3 of the edging machine, which, as previously stated, may be any standard machine on the market. The sheet or blank a is deposited on the frame 3 between the lugs 4 and dogs 5, and with an inward stroke of said frame (which stroke is shown at its beginning in Fig. 3) the sheet is forced through the edging grooves of the members 7 7, as well understood in the art. With a return outward stroke a fresh sheet or blank 'is deposited on the frame, and inthis return stroke the dogs 5 are caused tol yield and pass underthe first sheet temporarily held between the edging members 7, 7 With the second inward stroke of the feed-frame the dogs 5 (which only yield -in one direction) push the edged blank or sheet'out of the grooves of the edging members4 and advance it across the gap or recess V in the'block 17, the advancing sheet being guided across the gap by the angle-bars G, G,`the strokes being so regulated that with each inward stroke of the feed-frame after the first reciprocation, a sheet is pushed out from between the edgin members 7, 7, over the gap of the block 1 and squarely under the former 14. The feed of the blanks is likewise so timed that the edged blank is pushed acrossthe block 17 after and during the time that the former 14 is occupying a position above the plane of the upper surface of the block (Fig. 1). The edged blank thus positioned beneath the former :(14): isthen subjected to a pressure from the top by the former against the inner face of the bushing of the die 15, and atthe proper moment to pressure from opposite sides by the dies 18 (while the former is still down of course), after which the former 14 and dies 18 are retracted through the instrumentality ofthe various cams actuating the several punch and die elements as already described. With the elevation of the former 14, the formed pipe R is assisted in leaving the die 15 by the upward pressure of the follower rods 28, which were depressed with the descending movement of the 'former (their springs 29 yielding to the superior force of the expanding toggle links by which the former is immediately actuated). v As previously pointed out in detail, the former 14 remains Aelevated while the rollers c of the bellclanks 35 are traversing the circular faces m of the cams 38, that is to say,`whilevthe roll- .ers c' of the bell-cranks 35 are traversing the faces d of the cams 39 (Figs. 10, 11).. This of course corresponds to thev period that the side dies' 18 are retracted, and while thel roller 24 of the lever 24 is traversing thel surface 7c of the cam 41 and the rollers 23 of the bell-cranks 21" are traversing the faces g of the cams 4Q (Figs. 12, 13). While the former 14 with its loosely wrapped pipe R is thus maintained in. its elevated or raised position, the cam 57 of the gear 56 passes over the roller 58 of the short arm of the bent lever 59, the long arm of the latter being forced or oscillated inwardly, thereby pushing the ejecting frame 62 inwardly. The fingers 67 at the inner end of said ejecting frame engaging as they do the adjacent end'of the pipe R, simply push or move the pipe along and off the former, the pipe being thus dislodged from the former and ejected from the machine. After the cam'57 has passed off the roller 58 the lever 59 and its ejecting frame 62 return to their normal ororiginal position under the action of the contracting spring 68, one end of which is coupled to a post or bracket 69 on the frame F, and the opposite end to the long arm of the lever 59.

It may be stated in passing that the sheet a while occupying a position between the edging members 7, 7,is supported in the middle to prevent sagging thereof, by a strip 70, one end of which is secured to the top of the bracket 6, the opposite end being secured to a bracket, bar, or equivalent member 71 between the standards S, said bar likewise serving to support the inner ends ofthe edging members 7, 7. These are however mechanical eXpedients within the purview of'any skilled mechanic and may be vvaried at pleasure, and no attempt is here made to emphasize their detailed construction (Figs. 2, 4,). In the present illustration, the 'source of power is supposed to ypipe (only one end being crimped as well understood in the art), other sections or' portions' being left'plain; and when two pipe sections are assembled the leakage 1s thusreduced to a minimum. The completed unlocked pipe is indicated in Fig. 14, the edged edges being shown separated, this separation being due to the web or wall 13 connected to the former 14) against which t e edged blank is folded. The open pipe permits the same to be nested with others for shipment and is locked by the dealer or hardware man by the interlocking of the folds b, b, before being delivered to the' .Y customer.

It is to be understood that the present machine may operate on a blank a which is not previously edged, and I do not wish to restrict the invention to the forming of edged blanks, as plain blanks may be treated equally as well as edged blanks.

Having described my invention, what I claim is l. In amachine of the character described, ai blank-feeding member, a member provided with a gap or cavity across which the blank is advanced, a pipe-forming member reciprocating opposite the cavity and operating to force the blank thereinto, a complementary die in the cavity in the path of the reciprocation of the forming member aforesaid againstI which a section of the blank may be forced, dies operating from opposite sides of the plane of reciprocation of the forming member for forcing other sections of the blank against the forming member, and means for withdrawing the said dies from the blank, the latter adhering to the forming member after such withdrawal.

2. In amachine of the character described, a blank-feeding inember, a member provided with a cavity across and along which the blank is advanced, a substantially cylindri-V cal pipe former or punch reciprocating opposite the cavity and'operating to bend the blank and force the same into the cavity, a complementary die in the cavity against which the bottom peripheral portion of the punch and a correspondin section of the blank may be driven, side dies reciprocating across the path of reciprocation of the punch and provided with faces contoured to conform to the surface of the punch for forcing the remaining. portions of the blank against the corresponding peripheral porremaining portions of the periphery of the License tions of the punch, whereby the blank wraps l.around the punch and loosely adheres thereto.

3..In a machine of the character described, ablank-feeding member, a member provided with a cavity across and along which the blank is advanced, a substantially cylindrical pipeformer or punch reciprocating opposite the cavity and operating to bend the blank and force the same into the cavity, a complementary die in the cavity in the path of movement of the punch for engaging a portion of the' peripheral surface of the punch and a corresponding portion of the blank, reciprocating side dies operating across the path of reciprocation of the punch and contour to conform to the surface of said punch for forcing the remaining portions of the blank against the punch whereby the blank wraps around the punch, and a member on lthe punch for maintaining the edges of the wrapped blank a'iixed distance apart.

4. In av machine of the character described, a blank-feeding member, a member provided with a cavity across and along which the blank is advanced, a pipe former or punch reciprocating opposite the cavity and operating to bend the blank and force the same into the cavity, a complementary die in the cavity in the path of movement of f the punch for engaging a portion of the peripheral surface of the punch and a corresponding section of the blank, reciprocating side dies operating across the path of reciprocation of the punch and contour to conform to the surface of the punch for forcing the remaining sections of the blank against the remaining peripheral portions of the punch, a longitudinally disposed peripheral formation on the punch for maintaining the edges of the blank wrapped about the punch a fixed distance apart, suitable cam-shafts, and intermediate connecno tions between said shafts and the punch and movable. dies for imparting thereto the necessary reciprocations.

5. In a machine of the character' described, a reciprocating former, a cam-shaft 115 disposed on either side of the plane of reciprocation thereof, a `cam on one shaft and a coperating cam on the opposite shaft, bell-cranks mounted to engage the riding surfaces or formations= of the respective cams, links leading from corresponding lever arms of the bell-cranks, a toggle-joint coupled to the links and comprising a pair of toggle-links, the pivotal terminal or one of the links being fixed and the correspond-f ing terminal of the opposite link being coupled to the reciprocating former, the riding surfaces of the cams being shaped to cause an oscillation ofthe bell-'cranks simultaneously in the same direction Where- 1.90

by the toggle-links are alternately expanded and contracted, and a corresponding reciprocation imparted to the former aforesaid.

6. In a machine of the character described, a reciprocating former, a cam-shaft disposed on either side of the plane of reciprocation thereof, a cam on one shaft having a coperating cam on the opposite shaft, bell-cranks mounted to engage the riding surfaces orA formations of the respective cams, links leading from corresponding lever-arms ot' the bell-cranks, a toggle-joint coupled` to the links and comprising a pair of toggle-links the outer pivotal terminal of one of the links being iXed and the corresponding terminal of the opposite link being coupled to the reciprocating former, side dies .mounted on opposite sides of the plane of reciprocation of the former, a second set of cams on the cam-shafts, bellcranks mounted to nengage the riding surfaces of said latter cams, links leading from corresponding lever-arms of said bellcranks and coupled to the side dies, the riding surfaces of the several cams being such as to impose a proper oscillation on the bellcranks to impart proper reciprocation to the former and side dies aforesaid.

7. In a machine of the character described, a pipe-forming member operating on a suitable blank, suitable driving means for said member, lmeans for effecting a wrapping or folding of said blank kabout the member, a reciprocating ejecting member engaging the blank Wrapped about the forming member, intermediate mechanism interposed between the ejecting member and 'the driving means aforesaid for automati- :for said member, means for efecting a Wrapping or folding of saidblank about said former, a reciprocating ejecting member engaging one end of the blank Wrapped about said former, an oscillating lever coupled to said ejecting member, and a cam actuated by said driving gear and periodically tripping the oscillating lever for imparting the necessary movement to' the ejecting member for dislodging the blank from the former member. i In testimony whereof I aliX my signature, in presence of two Witnesses.

RIOHARD-R. DIETRICH. Witnesses:

EMIL Sfr-AREE, Jos. A. MICHEL. 

